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Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5827b&link_type=abstract
HST Proposal ID #5827
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Hst Proposal Id #5827 Interstellar Medium
Scientific paper
We propose using ECH-B and G140L gratings of the GHRS to observe the one bright (V < 12.5) supernova which is likely to occur during Cycle 5 in order to probe the interstellar gas of the host galaxy as well as gas in the local Galactic halo. We wish to observe Mg II and Mg I absorption lines with ECH-B; the 3 kms echelle resolution will enable us to resolve individual components within the absorption lines, study the kinematic structure of the absorbing gas, and derive accurate column densities and Doppler parameters of absorbing clouds. We would use the G140L grating to search for C IV and Si IV absorption, as well as strong low ionization lines of O I, C II, Ni II & Si II from both the host galaxy and the Milky Way. C IV/C II & Si IV/Si II ratios will then provide details on the ionization conditions in the gas. Information on interstellar absorption from any low-redshift galaxy other than our own is sparse, and our aim is to detect lines whose strengths and structures can be compared with Galactic absorption and absorption seen at high redshift in QSO spectra. Should a SN occur with V < 11, we would add exposures of C IV with the G160M grating, Zn II, Cr II with the G190M grating, and LyAlpha absorption with the G140L grating. Such data would allow us to calculate metallicities and depletions of intervening gas clouds, values which can be compared with higher redshift abundance studies.
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